Description:Material: PlasticColor: BlackHeight: approx 4.5cm / 1.77 inchHole inner diameter: approx 5cm / 1.97 inchMade of solid plastic、 durable and long lastingQuick release、 not easy to slidePerfect for crossfit workouts、 Olympic lifts、 overhead press、deadlifts、bench press、 and so onPackage Includes:1 x Pair of barbell collars